Electronic device and method of driving the same

ABSTRACT

An electronic device includes a display panel including pixels respectively connected to scan lines, scan stages corresponding to the scan lines, where each of the scan stages receives a carry signal, and outputs a scan signal, masking circuits electrically connected to some of the scan stages, respectively, where each of the masking circuits outputs a masking carry signal in response to a masking signal and the scan signal, and transmission circuits electrically connected to others of the scan stages, respectively, where each of the transmission circuits outputs the scan signal output from a corresponding scan stage among the scan stages. A j-th (j is an integer greater than 1) scan stage among the scan stages receives one of the scan signal output from a (j−1)-th scan stage and the masking carry signal as the carry signal.

This application claims priority to Korean Patent Application No.10-2021-0047040, filed on Apr. 12, 2021, and all the benefits accruingtherefrom under 35 U.S.C. § 119, the content of which in its entirety isherein incorporated by reference.

BACKGROUND 1. Field

The disclosure relates to an electronic device in which a powerconsumption and a difference in brightness between pixels are reduced,and a method of driving the electronic device.

2. Description of the Related Art

Among display devices, an organic light emitting display device displaysan image using an organic light emitting diode that generates a lightfrom electron-hole recombination. The organic light emitting displaydevice has desired characteristics, such as fast response speed and lowpower consumption.

The organic light emitting display device typically includes data lines,scan lines, and pixels connected to the data lines and the scan lines.Each pixel may include the organic light emitting diode and a circuitunit that controls an amount of current flowing through the organiclight emitting diode. The circuit unit controls the amount of currentflowing from a first driving voltage to a second driving voltage via theorganic light emitting diode in response to a data signal. In this case,a light with a predetermined luminance corresponding to the amount ofcurrent flowing through the organic light emitting diode is generated.

SUMMARY

Recently, as the fields of use of the display device are diversified, aplurality of different images may be simultaneously displayed on asingle display device. Accordingly, a technology for reducing powerconsumption of the display device when displaying the plural images isdesired.

The disclosure provides an electronic device in which a powerconsumption and a difference in brightness between pixels are reduced.

The disclosure provides a method of driving the electronic device.

An embodiment of the invention provides an electronic device including adisplay panel including a plurality of data lines, a plurality of scanlines, and a plurality of pixels connected to the data lines and thescan lines, a plurality of scan stages corresponding to the scan lines,where each of the scan stages receives clock signals and a carry signal,and outputs a scan signal, a plurality of masking circuits electricallyconnected to some of the scan stages, respectively, where each of themasking circuits outputs a masking carry signal in response to a maskingsignal and the scan signal, and a plurality of transmission circuitselectrically connected to others of the scan stages, respectively, whereeach of the transmission circuits outputs the scan signal output from acorresponding scan stage among the scan stages. In such an embodiment, aj-th scan stage among the scan stages receives one of the scan signaloutput from a (j−1)-th scan stage and the masking carry signal as thecarry signal, where j is a positive integer number greater than 1).

In an embodiment, the masking signal may include a first masking signaland a second masking signal, each of the masking circuits outputs thescan signal output from the corresponding scan stage as the maskingcarry signal when the first masking signal has a first level and thesecond masking signal has a second level different from the first level,and each of the masking circuits may not output the scan signal outputfrom the corresponding scan stage as the masking carry signal when thefirst masking signal has the second level and the second masking signalhas the first level.

In an embodiment, each of the masking circuits may include a firstmasking transistor connected between a terminal of the correspondingscan stage, from which the scan signal of the corresponding scan stageamong the scan stages is output, and a carry output terminal, where thefirst masking transistor may include a first gate electrode whichreceives the first masking signal and a second masking transistorconnected between the carry output terminal and a first voltage terminalwhich receives a first voltage of the corresponding scan stage, wherethe second masking transistor may include a second gate electrode whichreceives the first masking signal.

In an embodiment, each of the transmission circuits may include a firsttransmission transistor connected between the terminal of thecorresponding scan stage and the carry output terminal, where the firsttransmission transistor may include a third gate electrode whichreceives the first voltage and a second transmission transistorconnected between the carry output terminal and the first voltageterminal, where the second transmission transistor may include a fourthgate electrode which receives a second voltage different from the firstvoltage.

In an embodiment, the electronic device may further include a drivingcontroller which drives the display panel in a multi-frequency mode anda normal mode.

In an embodiment, the display panel may include a first display area anda second display area adjacent to the first display area, the firstdisplay area is driven at a first driving frequency in themulti-frequency mode, and the second display area is driven at a seconddriving frequency different from the first driving frequency in themulti-frequency mode.

In an embodiment, the first driving frequency may be higher than thesecond driving frequency.

In an embodiment, the driving controller may control the scan stages andthe masking circuits.

In an embodiment, the driving controller may substantiallysimultaneously display a still image and a video through the firstdisplay area in the multi-frequency mode and changes the multi-frequencymode of the first display area to the normal mode when a time durationof the still image reaches a predetermined time.

In an embodiment, areas in which the masking circuits are respectivelydisposed may be the same as areas in which the transmission circuits arerespectively disposed.

In an embodiment, the electronic device may further include a pluralityof light emitting stages, the display panel may further include aplurality of light emitting control lines electrically connected to thepixels, respectively, and the light emitting stages may be electricallyconnected to the light emitting control lines, respectively, and receivethe clock signals and the carry signal.

In an embodiment, the scan stages may include first scan stages, secondscan stages, and third scan stages, areas in which the first scanstages, the second stages, and the light emitting stages arerespectively disposed may have a same size as each other, and areas inwhich the third scan stages are respectively disposed may have a sizesmaller than areas in which the first scan stages are respectivelydisposed.

In an embodiment, the masking signal may have a width greater than awidth of the scan signal.

In an embodiment, the scan signal may include a first portion having afirst level and a second portion subsequent to the first portion andhaving a second level lower than the first level.

In an embodiment, the masking signal may overlap an entire portion ofthe scan signal output from one of the scan stages respectivelyconnected to the masking circuits.

In an embodiment, a first scan signal output from an n-th scan stageamong the scan stages respectively connected to the masking circuits maynot overlap a second scan signal output from an (n−1)-th scan stageamong the scan stages, where n is an integer greater than 1.

In an embodiment, the second scan signal may not overlap the maskingsignal.

In an embodiment, the first scan signal may overlap the masking signal.

In an embodiment, the masking signal may have a width greater than awidth of each of the first and second scan signals.

An embodiment of the invention provides a method of driving anelectronic device including a display panel and a plurality of scanstages, the method including allowing an i-th scan stage among the scanstages to receive clock signals and a carry signal and to output a firstscan signal, allowing a masking circuit connected to the i-th scan stageto receive a masking signal and to output a masking carry signal basedon the masking signal, where i is an integer greater than 0, andallowing an (i+1)-th scan stage among the scan stages to receive themasking carry signal as the carry signal and to output a second scansignal. In such an embodiment, the masking signal has a first widthgreater than a second width of the first scan signal, and the maskingsignal overlaps an entire portion of the first scan signal.

In an embodiment, the masking signal may include a first masking signaland a second masking signal, and the outputting the masking carry signalmay include outputting the first scan signal as the masking carry signalwhen the first masking signal has a first level and the second maskingsignal has a second level different from the first level and allowingthe first scan signal not to be output as the masking carry signal whenthe first masking signal has the second level and the second maskingsignal has the first level.

In an embodiment, the method further may include driving the displaypanel, where the display panel may include a first display area and asecond display area adjacent to the first display area, and the drivingthe display panel may include driving the display panel in amulti-frequency mode or a normal mode, driving the first display area ata first driving frequency in the multi-frequency mode, and driving thesecond display area at a second driving frequency different from thefirst driving frequency in the multi-frequency mode.

In an embodiment, the first driving frequency may be higher than thesecond driving frequency.

In an embodiment, the driving the display panel in the multi-frequencymode or the normal mode may include substantially simultaneouslydisplaying a still image and a video through the first display area inthe multi-frequency mode and changing the multi-frequency mode of thefirst display area to the normal mode when a time duration of the stillimage reaches a predetermined time.

In an embodiment, the carry signal may include a first portion having afirst level and a second portion subsequent to the first portion andhaving a second level lower than the first level.

In an embodiment, the masking circuit may be provided in plural, and athird scan signal output from an n-th scan stage among the scan stagesrespectively connected to the masking circuits may not overlap a fourthscan signal output from an (n−1)-th scan stage among the scan stages,where n is an integer greater than 1.

In an embodiment, the fourth scan signal may not overlap the maskingsignal.

In an embodiment, the third scan signal may overlap the masking signal.

In an embodiment, the masking signal may have a width greater than awidth of each of the third scan signal and the fourth scan signal.

According to embodiments of the invention, the electronic device drivesthe first display area displaying the video at a normal frequency anddrives the second display area displaying the still image at a lowfrequency lower than the normal frequency. As the driving frequency ofthe second display area is reduced, a power consumption of theelectronic device decreases.

In such embodiments, the masking circuits are electrically connected tosome of the scan stages, and the transmission circuits are electricallyconnected to others of the scan stages. In such embodiments, the areaswhere the scan stages are respectively disposed include a same number oftransistors and have a same circuit density as each other. The areashave a same load, and each of the scan stages disposed in the areas hasa same characteristics. Accordingly, a difference in brightness betweenrows in which the pixels are arranged is reduced. In such embodiments, acrosstalk phenomenon which may cause an image quality of the displaypanel to decrease due to different electrical interference between thepixels is reduced.

In such embodiments, the masking signal covers the scan signal outputfrom the scan stage electrically connected to the masking circuit. Themasking circuit stops (or masks) the outputting of the scan signal asthe carry signal. The carry signal output from the transmission circuitis maintained at low level. Thus, the occurrence of difference inbrightness between the pixel rows is effectively prevented.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features of the disclosure will become readilyapparent by reference to the following detailed description whenconsidered in conjunction with the accompanying drawings, in which:

FIG. 1 is a plan view showing an electronic device according to anembodiment of the disclosure;

FIGS. 2A and 2B are perspective views showing an electronic deviceaccording to an embodiment of the disclosure;

FIG. 3A is a view showing an operation of a display panel in a normalmode;

FIG. 3B is a view showing an operation of the display panel in amulti-frequency mode;

FIG. 4 is a block diagram showing an electronic device according to anembodiment of the disclosure;

FIG. 5 is an equivalent circuit diagram showing a pixel according to anembodiment of the disclosure;

FIG. 6 is a signal timing diagram showing an operation of the pixelshown in FIG. 5;

FIG. 7 is a block diagram showing an embodiment of a first drivingcircuit shown in FIG. 4;

FIG. 8 is a block diagram showing an embodiment of a second drivingcircuit shown in FIG. 4;

FIG. 9 is a block diagram showing the first driving circuit shown inFIG. 7 and the second driving circuit shown in FIG. 8;

FIG. 10 is a view showing an embodiment of light emitting stages, firstscan stages, and second scan stages in the first driving circuit;

FIG. 11 is a circuit diagram showing a first second scan stage and atransmission circuit in a first driving circuit according to anembodiment of the disclosure;

FIG. 12 is a circuit diagram showing a second second scan stage and amasking circuit in a first driving circuit according to an embodiment ofthe disclosure;

FIG. 13A is a waveform diagram showing a masking signal, a scan signal,and a carry signal according to an embodiment of the disclosure;

FIG. 13B is a waveform diagram showing signals of a comparative example;

FIG. 14 is a waveform diagram showing a masking signal and a scan signalaccording to an embodiment of the disclosure; and

FIG. 15 is a waveform diagram showing scan signals in a multi-frequencymode according to an embodiment of the disclosure.

DETAILED DESCRIPTION

The invention now will be described more fully hereinafter withreference to the accompanying drawings, in which various embodiments areshown. This invention may, however, be embodied in many different forms,and should not be construed as limited to the embodiments set forthherein. Rather, these embodiments are provided so that this disclosurewill be thorough and complete, and will fully convey the scope of theinvention to those skilled in the art.

In the disclosure, it will be understood that when an element or layeris referred to as being “on”, “connected to” or “coupled to” anotherelement or layer, it can be directly on, connected or coupled to theother element or layer or intervening elements or layers may be present.In contrast, when an element is referred to as being “directly on”another element, there are no intervening elements present.

Like numerals refer to like elements throughout. In the drawings, thethickness of layers, films, and regions are exaggerated for clarity.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting. As used herein,“a”, “an,” “the,” and “at least one” do not denote a limitation ofquantity, and are intended to include both the singular and plural,unless the context clearly indicates otherwise. For example, “anelement” has the same meaning as “at least one element,” unless thecontext clearly indicates otherwise. “At least one” is not to beconstrued as limiting “a” or “an.” “Or” means “and/or.” As used herein,the term “and/or” includes any and all combinations of one or more ofthe associated listed items. It will be further understood that theterms “comprises” and/or “comprising,” or “includes” and/or “including”when used in this specification, specify the presence of statedfeatures, regions, integers, steps, operations, elements, and/orcomponents, but do not preclude the presence or addition of one or moreother features, regions, integers, steps, operations, elements,components, and/or groups thereof.

It will be understood that, although the terms “first,” “second,”“third” etc. may be used herein to describe various elements,components, regions, layers and/or sections, these elements, components,regions, layers and/or sections should not be limited by these terms.These terms are only used to distinguish one element, component, region,layer or section from another element, component, region, layer orsection. Thus, “a first element,” “component,” “region,” “layer” or“section” discussed below could be termed a second element, component,region, layer or section without departing from the teachings herein.

Spatially relative terms, such as “beneath”, “below”, “lower”, “above”,“upper” and the like, may be used herein for ease of description todescribe one element or feature's relationship to another element(s) orfeature(s) as illustrated in the figures. It will be understood that thespatially relative terms are intended to encompass differentorientations of the device in use or operation in addition to theorientation depicted in the figures. For example, if the device in thefigures is turned over, elements described as “below” or “beneath” otherelements or features would then be oriented “above” the other elementsor features. Thus, the term “below” can encompass both an orientation ofabove and below. The device may be otherwise oriented (rotated 90degrees or at other orientations) and the spatially relative descriptorsused herein interpreted accordingly.

“About” or “approximately” as used herein is inclusive of the statedvalue and means within an acceptable range of deviation for theparticular value as determined by one of ordinary skill in the art,considering the measurement in question and the error associated withmeasurement of the particular quantity (i.e., the limitations of themeasurement system). For example, “about” can mean within one or morestandard deviations, or within ±30%, 20%, 10% or 5% of the stated value.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosure belongs. It willbe further understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meaning in the context of the relevant art andwill not be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

It will be further understood that the terms “includes” and/or“including”, when used in this specification, specify the presence ofstated features, integers, steps, operations, elements, and/orcomponents, but do not preclude the presence or addition of one or moreother features, integers, steps, operations, elements, components,and/or groups thereof.

Embodiments described herein should not be construed as limited to theparticular shapes of regions as illustrated herein but are to includedeviations in shapes that result, for example, from manufacturing. Forexample, a region illustrated or described as flat may, typically, haverough and/or nonlinear features. Moreover, sharp angles that areillustrated may be rounded. Thus, the regions illustrated in the figuresare schematic in nature and their shapes are not intended to illustratethe precise shape of a region and are not intended to limit the scope ofthe present claims.

Hereinafter, embodiments of the disclosure will be described in detailwith reference to the accompanying drawings.

FIG. 1 is a plan view showing an electronic device according to anembodiment of the disclosure.

Referring to FIG. 1, an embodiment of the electronic device DD may be aportable device, for example. The portable device may include a tabletpersonal computer (“PC”), a smartphone, a personal digital assistant(“PDA”), a portable multimedia player (“PMP”), a game unit, awrist-watch type electronic device, or the like, however, the disclosureis not limited thereto or thereby. Alternatively, the electronic deviceDD may be applied to a large-sized electronic device, such as atelevision set, an outdoor billboard, or the like, or a small- andmedium-sized electronic device, such as a personal computer, a notebookcomputer, a kiosk, a car navigation unit, a camera, or the like.Alternatively, the electronic device DD may be employed in otherelectronic items without departing from the teachings herein.

In an embodiment, as shown in FIG. 1, a display surface on which a firstimage IM1 and a second image IM2 are displayed may be on a planesubstantially parallel to a surface defined by a first direction DR1 anda second direction DR2. The electronic device DD may include a pluralityof areas distinguished from each other on the display surface. Thedisplay surface may include a display area DA on which the first imageIM1 and the second image IM2 are displayed and a non-display area NDAaround the display area DA. The non-display area NDA may be referred toas a bezel area. In one embodiment, for example, the display area DA mayhave a quadrangular shape. The non-display area NDA may surround thedisplay area DA. In an embodiment, although not shown in figures, theelectronic device may have a curved shape in a portion thereof. In suchan embodiment, the curved shape may be defined in a portion of thedisplay area DA.

The display area DA of the electronic device DD may include a firstdisplay area DA1 and a second display area DA2. In a specificapplication program, the first image IM1 may be displayed in the firstdisplay area DA1, and the second image IM2 may be displayed in thesecond display area DA2. In one embodiment, for example, the first imageIM1 may be a video, and the second image IM2 may be a still image ortext information with a long cycle of change.

In an embodiment, the electronic device DD may drive the first displayarea DA1 in which the video is displayed at a normal frequency and maydrive the second display area DA2 in which the still image is displayedat a low frequency lower than the normal frequency. In such anembodiment, the electronic device DD may decrease a driving frequency ofthe second display area DA2, and thus, a power consumption of theelectronic device DD may decrease.

Each of the first display area DA1 and the second display area DA2 mayhave a predetermined size, and the size of the first display area DA1and the second display area DA2 may vary according to an applicationprogram. According to an embodiment, when the still image is displayedin the first display area DA1 and the video is displayed in the seconddisplay area DA2, the first display area DA1 may be driven at the lowfrequency, and the second display area DA2 may be driven at the normalfrequency. In an embodiment, the display area DA may be divided intothree or more display areas, and the driving frequency of each of thedisplay areas may be determined depending on the type of image (stillimage or video) displayed in each of the display areas.

FIGS. 2A and 2B are perspective views showing an electronic device DD2according to an embodiment of the disclosure. FIG. 2A shows theelectronic device DD2 in an unfolded state, and FIG. 2B shows theelectronic device DD2 in a folded state.

Referring to FIGS. 2A and 2B, an embodiment of the electronic device DD2may include a display area DA and a non-display area NDA. The electronicdevice DD2 may display an image through the display area DA. When theelectronic device DD2 is in the unfolded state, the display area DA maybe on a plane defined by the first direction DR1 and the seconddirection DR2. A thickness direction of the electronic device DD2 may besubstantially parallel to a third direction DR3 crossing the firstdirection DR1 and the second direction DR2. Accordingly, a front surface(or an upper surface) and a rear surface (or a lower surface) of eachmember of the electronic device DD2 may be defined with respect to thethird direction DR3. The non-display area NDA may be referred to as abezel area. In one embodiment, for example, the display area DA may havea quadrangular shape. The non-display area NDA may surround the displayarea DA.

The display area DA may include a first non-folding area NFA1, a foldingarea FA, and a second non-folding area NFA2. The folding area FA may befolded or foldable about a folding axis FX extending in the firstdirection DR1.

When the electronic device DD2 is folded, the first non-folding areaNFA1 and the second non-folding area NFA2 may face each other.Accordingly, when the electronic device DD2 is completely folded, thedisplay area DA may not be exposed to the outside, and such a foldingoperation of the electronic device DD2 may be referred to as anin-folding operation, but the operation of the electronic device DD2should not be limited thereto or thereby.

In one embodiment, for example, when the electronic device DD2 isfolded, the first non-folding area NFA1 and the second non-folding areaNFA2 may face opposite directions to each other. Accordingly, when theelectronic device DD2 is folded, the first non-folding area NFA1 may beexposed to the outside, and such a folding operation may be referred toas an out-folding operation.

In an embodiment, the electronic device DD2 may be operated in only oneof the in-folding operation and the out-folding operation. According toan alternative embodiment, the electronic device DD2 may be operated inboth the in-folding operation and the out-folding operation. In such anembodiment, the same area of the electronic device DD2, for example, thefolding area FA may be inwardly folded (in-folding) and outwardly folded(out-folding). According to an embodiment, a portion of the electronicdevice DD2 may be inwardly folded (in-folding), and another portion ofthe electronic device DD2 may be outwardly folded (out-folding).

FIGS. 2A and 2B show an embodiment including a single folding area andtwo non-folding areas, for example, but the number of the folding areasand the number of the non-folding areas are not limited thereto orthereby. In one alternative embodiment, for example, the electronicdevice DD2 may include more than two non-folding areas and a pluralityof folding areas disposed between the non-folding areas.

In an embodiment, as shown in FIGS. 2A and 2B, the folding axis FX issubstantially parallel to a minor axis of the electronic device DD2, butthe disclosure are not limited thereto or thereby. In one alternativeembodiment, for example, the folding axis FX may extend in a directionsubstantially parallel to a major axis of the electronic device DD2,e.g., the second direction DR2. In such an embodiment, the firstnon-folding area NFA1, the folding area FA, and the second non-foldingarea NFA2 may be sequentially arranged in the first direction DR1.

A plurality of display areas DA1 and DA2 may be defined in the displayarea DA of the electronic device DD2. FIG. 2A shows an embodimentincluding two display areas DA1 and DA2, but the number of the displayareas DA1 and DA2 is not limited thereto or thereby.

The display areas DA1 and DA2 may include a first display area DA1 and asecond display area DA2. In one embodiment, for example, the firstdisplay area DA1 may be an area in which a first image IM1 is displayed,and the second display area DA2 may be an area in which a second imageIM2 is displayed. In one embodiment, for example, the first image IM1may be a video, and the second image IM2 may be a still image or textinformation with a long cycle of change.

Each of the first display area DA1 and the second display area DA2 mayhave a predetermined size, and the size of the first display area DA1and the second display area DA2 may vary according to an applicationprogram. According to an embodiment, the first display area DA1 maycorrespond to the first non-folding area NFA1, and the second displayarea DA2 may correspond to the second non-folding area NFA2. In such anembodiment, a first portion of the folding area FA may correspond to thefirst display area DA1, and a second portion of the folding area FA maycorrespond to the second display area DA2.

According to an embodiment, the entire folding area FA may correspond to(be included in or defined by a portion of) either the first displayarea DA1 or the second display area DA2.

According to an embodiment, the first display area DA1 may correspond toa first portion of the first non-folding area NFA1, and the seconddisplay area DA2 may correspond to a second portion of the firstnon-folding area NFA1, the folding area FA, and the second non-foldingarea NFA2. In such an embodiment, the size of the first display area DA1may be greater than the size of the second display area DA2.

According to an embodiment, the first display area DA1 may correspond tothe first non-folding area NFA1, the folding area FA, and a firstportion of the second non-folding area NFA2, and the second display areaDA2 may correspond to a second portion of the second non-folding areaNFA2. That is, the size of the second display area DA2 may be greaterthan the size of the first display area DA1.

In an embodiment, as shown in FIG. 2B, when the folding area FA isfolded, the first display area DA1 may correspond to the firstnon-folding area NFA1, and the second display area DA2 may correspond tothe folding area FA and the second non-folding area NFA2.

In an embodiment, as shown in FIGS. 2A and 2B, the electronic device DD2may include a single folding area, for example, but the disclosure isnot limited thereto or thereby. Alternatively, the disclosure may beapplied to an electronic device including two or more folding areas, arollable electronic device, or a slidable electronic device.

Hereinafter, for convenience of description, an embodiment of theelectronic device DD shown in FIG. 1 will be described in detail, butthe following descriptions may be applied to the electronic device DD2shown in FIGS. 2A and 2B.

FIG. 3A is a view showing an operation of a display panel DP in a normalmode NFM, and FIG. 3B is a view showing an operation of the displaypanel DP in a multi-frequency mode MFM.

Referring to FIG. 3A, an embodiment of the electronic device DD (referto FIG. 1) may include the display panel DP. According to an embodiment,the display panel DP may be a light emitting type display panel, but notbeing particularly limited. In one embodiment, for example, the displaypanel DP may be an organic light emitting display panel, a quantum dotdisplay panel, a micro-light emitting diode (“LED”) display panel, or anano-LED display panel. A light emitting layer of the organic lightemitting display panel may include an organic light emitting material. Alight emitting layer of the quantum dot display panel may include aquantum dot and a quantum rod. A light emitting layer of the micro-LEDdisplay panel may include a micro-LED. A light emitting layer of thenano-LED display panel may include a nano-LED. Hereinafter, forconvenience of description, embodiments where the display panel DP isthe organic light emitting display panel will be described in detail.

The display panel DP may include a first display area AA1 and a seconddisplay area AA2. When viewed in a plane, the first display area AA1 maycorrespond to the first display area DA1 (refer to FIG. 1) of theelectronic device DD (refer to FIG. 1), and the second display area AA2may correspond to the second display area DA2 (refer to FIG. 1) of theelectronic device DD (refer to FIG. 1).

The display panel DP may be operated differently depending on anoperation mode. The operation mode may include the normal mode NFM andthe multi-frequency mode MFM. In the normal mode NFM, the display panelDP may drive both the first display area AA1 and the second display areaAA2 at the normal frequency. In the multi-frequency mode MFM, thedisplay panel DP may drive the first display area AA1 in which the firstimage IM1 is displayed at a first driving frequency and may drive thesecond display area AA2 in which the second image IM2 is displayed at asecond driving frequency lower than the normal frequency. According toan embodiment, the first driving frequency may be the same as the normalfrequency.

Referring to FIG. 3A, the first image IM1 displayed in the first displayarea AA1 may be the video, and the second image IM2 displayed in thesecond display area AA2 may be the still image or the image with thelong cycle of change, e.g., a keypad for the control of a game.

In the normal mode NFM, the driving frequency of the first display areaAA1 and the second display area AA2 of the display panel DP may be thenormal frequency. In one embodiment, for example, the normal frequencymay be about 60 hertz (H)z. In the normal mode NFM, images of a firstframe F1 to a sixtieth frame F60 may be displayed for 1 second in thefirst display area AA1 and the second display area AA2 of the displaypanel DP, for example, but the normal frequency may be variouslymodified. In one alternative embodiment, for example, the normalfrequency may be about 120 Hz.

Referring to FIG. 3B, during the multi-frequency mode MFM, the displaypanel DP may set the driving frequency of the first display area AA1 inwhich the first image IM1, i.e., the video, is displayed to the firstdriving frequency and may set the driving frequency of the seconddisplay area AA2 in which the second image IM2, i.e., the still image,is displayed to the second driving frequency lower than the firstdriving frequency. When the normal frequency is about 60 Hz, the firstdriving frequency may be about 120 Hz, and the second driving frequencymay be about 1 Hz. The first driving frequency and the second drivingfrequency may be changed in various ways. In one embodiment, forexample, the first driving frequency may be about 144 Hz that is higherthan the normal frequency or may be about 60 Hz that is the same as thenormal frequency. In one embodiment, for example, the second drivingfrequency may be about 30 Hz, about 10 Hz, or about 1 Hz that is lowerthan the normal frequency.

In the multi-frequency mode MFM, when the first driving frequency isabout 120 Hz and the second driving frequency is about 1 Hz, the firstimage IM1 of the first frame F1 to a 120th frame F120 may be displayedfor 1 second through the first display area AA1. The second image IM2may be displayed in the second display area AA2 only in the first frameF1, and images may not be displayed in the other frames F2 to F120.

FIG. 4 is a block diagram showing the electronic device DD according toan embodiment of the disclosure.

Referring to FIG. 4, an embodiment of the electronic device DD mayinclude the display panel DP, a driving controller 100, a data drivingcircuit 200, a first driving circuit 300, a second driving circuit 400,and a voltage generator 500.

The driving controller 100 may receive an input signal including imagesignals RGB and control signals CTRL. The driving controller 100 mayconvert a data format of the image signals RGB to a data formatappropriate to an interface between the data driving circuit 200 and thedriving controller 100 to generate image data signals DATA. The drivingcontroller 100 may control the data driving circuit 200, the firstdriving circuit 300, and the second driving circuit 400 such that theimage is displayed on the display panel DP. The driving controller 100may output a first scan control signal SCS1, a second scan controlsignal SCS2, and a data control signal DCS based on the control signalCTRL.

The data driving circuit 200 may receive the data control signal DCS andthe image data signals DATA from the driving controller 100. The datadriving circuit 200 may convert the image data signals DATA to datasignals and may output the data signals to a plurality of data lines DL1to DLm which will be described later. The data signals may be analogvoltages corresponding to grayscale values of the image data signalsDATA.

The voltage generator 500 may generate voltages used to operate thedisplay panel DP. The voltage generator 500 may generate a first drivingvoltage ELVDD, a second driving voltage ELVSS, a first initializationvoltage VINT1, and a second initialization voltage VINT2.

The display panel DP may include scan lines GIL1 to GILn, GCL1 to GCLn,and GWL1 to GWLn+1, light emitting control lines EML1 to EMLn, the datalines DL1 to DLm, and pixels PX. The first driving circuit 300 may bedisposed at a first side of the display panel DP, and the second drivingcircuit 400 may be disposed at a second side of the display panel DP.The scan lines GIL1 to GILn, GCL1 to GCLn, and GWL1 to GWLn+1 and thelight emitting control lines EML1 to EMLn may be electrically connectedto the first driving circuit 300 and the second driving circuit 400.

The scan lines GIL1 to GILn, GCL1 to GCLn, and GWL1 to GWLn+1 and thelight emitting control lines EML1 to EMLn may be arranged in the seconddirection DR2 and may be spaced apart from each other. The data linesDL1 to DLm may extend in a direction opposite to the second directionDR2 from the data driving circuit 200 and may be arranged in the firstdirection DR1 to be spaced apart from each other.

In an embodiment of the electronic device DD, as shown in FIG. 4, thefirst driving circuit 300 and the second driving circuit 400 may bedisposed to face each other with the pixels PX interposed therebetween,but the disclosure is not limited thereto or thereby. According to analternative embodiment, the electronic device DD may include only one ofthe first driving circuit 300 and the second driving circuit 400.

The pixels PX may be electrically connected to the scan lines GIL1 toGILn, GCL1 to GCLn, and GWL1 to GWLn+1, the light emitting control linesEML1 to EMLn, and the data lines DL1 to DLm, respectively. Each of thepixels PX may be electrically connected to four scan lines and one lightemitting control line. In one embodiment, for example, as shown in FIG.4, the pixels arranged in a first row may be connected to the scan linesGILL GCL1, GWL1, and GWL2 and the light emitting control line EML1. Inan embodiment, the pixels arranged in a j-th row may be connected toscan lines GILj, GCLj, GWLj, and GWLj+1 and light emitting control lineEMLj.

Each of the pixels PX may receive the first driving voltage ELVDD, thesecond driving voltage ELVSS, the first initialization voltage VINT1,and the second initialization voltage VINT2.

The first driving circuit 300 may receive the first scan control signalSCS1 from the driving controller 100. The first driving circuit 300 mayoutput scan signals to the scan lines GIL1 to GILn, GCL1 to GCLn, andGWL1 to GWLn+1 and may output light emitting signals to the lightemitting control lines EML1 to EMLn in response to the first scancontrol signal SCS1.

The second driving circuit 400 may receive the second scan controlsignal SCS2 from the driving controller 100. The second driving circuit400 may output the scan signals to the scan lines GIL1 to GILn, GCL1 toGCLn, and GWL1 to GWLn+1 and may output the light emitting signals tothe light emitting control lines EML1 to EMLn in response to the secondscan control signal SCS2.

The driving controller 100 may divide the display panel DP into thefirst display area AA1 (refer to FIG. 3A) and the second display areaAA2 (refer to FIG. 3A) and may set the driving frequency of each of thefirst display area AA1 (refer to FIG. 3A) and the second display areaAA2 (refer to FIG. 3A) based on the input signal including the imagesignals RGB and the control signals CTRL. In one embodiment, forexample, in the normal mode NFM (refer to FIG. 3A), the drivingcontroller 100 may drive each of the first display area AA1 (refer toFIG. 3A) and the second display area AA2 (refer to FIG. 3A) at thenormal frequency, e.g., about 60 Hz. In the multi-frequency mode MFM(refer to FIG. 3B), the driving controller 100 may output the first scancontrol signal SCS1, the second scan control signal SCS2, and the datacontrol signal DCS to drive the first display area AA1 (refer to FIG.3B) at the first driving frequency, e.g., about 120 Hz, and to drive thesecond display area AA2 (refer to FIG. 3B) at the second drivingfrequency, e.g., about 1 Hz.

In the multi-frequency mode MFM (refer to FIG. 3B), the drivingcontroller 100 may substantially simultaneously display the still imageand the video in the first display area AA1 (refer to FIG. 3B). Thedriving controller 100 may change a mode of the first display area AA1(refer to FIG. 3B) to the normal mode NFM (refer to FIG. 3A) when aduration of the still image reaches a predetermined time.

FIG. 5 is an equivalent circuit diagram showing a pixel PXij accordingto an embodiment of the disclosure.

FIG. 5 shows an equivalent circuit diagram of an embodiment of the pixelPXij connected to an i-th data line DLi among the data lines DL1 to DLm,j-th scan lines GILj, GCLj, and GWLj and a (j+1)th scan line GWLj+1among the scan lines GIL1 to GILn, GCL1 to GCLn, and GWL1 to GWLn+1 anda j-th light emitting control line EMLj among the light emitting controllines EML1 to EMLn shown in FIG. 4.

Each of the pixels PX shown in FIG. 4 may have substantially the sameconfiguration as that of the equivalent circuit diagram of the pixelPXij shown in FIG. 5.

Each of the pixels PX may include a light emitting diode ED and a pixelcircuit PXC that controls a light emission of the light emitting diodeED. The pixel circuit PXC may include one or more transistors and one ormore capacitors. The first driving circuit 300 and the second drivingcircuit 400 may include transistors formed through the same process asthe pixel circuit PXC.

The pixel circuit PXC of the pixel PXij may include first, second,third, fourth, fifth, sixth, and seventh transistors T1, T2, T3, T4, T5,T6, and T7. Among the first to seventh transistors T1 to T7, each of thethird and fourth transistors T3 and T4 is an N-type transistor includingan oxide semiconductor as its semiconductor layer, and each of thefirst, second, fifth, sixth, and seventh transistors T1, T2, T5, T6, andT7 is a P-type transistor including a low-temperature polycrystallinesilicon (“LTPS”) as a semiconductor layer thereof. However, thedisclosure is not limited thereto or thereby, and alternatively, all thefirst to seventh transistors T1 to T7 may be the P-type transistor orthe N-type transistor. According to an embodiment, at least one of thefirst to seventh transistors T1 to T7 may be the N-type transistor, andanother of the first to seventh transistors T1 to T7 may be the P-typetransistor. In an embodiment, the circuit configuration of the pixel isnot limited to that shown in FIG. 5. FIG. 5 shows merely one embodimentof the pixel circuit PXC, and the configuration of the pixel circuit PXCmay be variously modified.

Referring to FIG. 5, an embodiment of the pixel PXij of the electronicdevice may include the first to seventh transistors T1, T2, T3, T4, T5,T6, and T7, a capacitor Cst, and at least one light emitting diode ED.Hereinafter, an embodiment having a structure in which one pixel PXijincludes a single light emitting diode ED will be described.

The scan lines GILj, GCLj, GWLj, and GWLj+1 may transmit scan signalsGIj, GCj, GWj, and GWj+1, respectively, and the light emitting controlline EMLj may transmit a light emitting signal EMj. The data line DLimay transmit a data signal Di. The data signal Di may have a voltagelevel corresponding to the image signal RGB input to the electronicdevice DD (refer to FIG. 4). In such an embodiment, first, second,third, and fourth driving voltage lines VL1, VL2, VL3, and VL4 maytransmit the first driving voltage ELVDD, the second driving voltageELVSS, the first initialization voltage VINT1, and the secondinitialization voltage VINT2, respectively.

The first transistor T1 may include a first electrode connected to thefirst driving voltage line VL1 via the fifth transistor T5, a secondelectrode electrically connected to an anode of the light emitting diodeED via the sixth transistor T6, and a gate electrode connected to oneend of the capacitor Cst. The first transistor T1 may receive the datasignal Di transmitted by the data line DLi based on a switchingoperation of the second transistor T2 and may supply a driving currentId to the light emitting diode ED.

The second transistor T2 may include a first electrode connected to thedata line DLi, a second electrode connected to the first electrode ofthe first transistor T1, and a gate electrode connected to the scan lineGWLj. The second transistor T2 may be turned on in response to the scansignal GWj applied thereto via the scan line GWLj and may transmit thedata signal Di applied thereto via the data line DLi to the firstelectrode of the first transistor T1.

The third transistor T3 may include a first electrode connected to thegate electrode of the first transistor T1, a second electrode connectedto the second electrode of the first transistor T1, and a gate electrodeconnected to the scan line GCLj. The third transistor T3 may be turnedon in response to the scan signal GCj applied thereto via the scan lineGCLj and may connect the gate electrode and the second electrode of thefirst transistor T1 to each other to allow the first transistor T1 to beconnected in a diode configuration.

The fourth transistor T4 may include a first electrode connected to thegate electrode of the first transistor T1, a second electrode connectedto the third driving voltage line VL3 to which the first initializationvoltage VINT1 is transmitted, and a gate electrode connected to the scanline GILj. The fourth transistor T4 may be turned on in response to thescan signal GIj applied thereto via the scan line GILj and may transmitthe first initialization voltage VINT1 to the gate electrode of thefirst transistor T1 to perform an initialization operation thatinitializes a voltage of the gate electrode of the first transistor T1.

The fifth transistor T5 may include a first electrode connected to thefirst driving voltage line VL1, a second electrode connected to thefirst electrode of the first transistor T1, and a gate electrodeconnected to the light emitting control line EMLj.

The sixth transistor T6 may include a first electrode connected to thesecond electrode of the first transistor T1, a second electrodeconnected to the anode of the light emitting diode ED, and a gateelectrode connected to the light emitting control line EMLj.

The fifth transistor T5 and the sixth transistor T6 may be substantiallysimultaneously turned on in response to the light emitting signal EMjapplied thereto via the light emitting control line EMLj, and thus, thefirst driving voltage ELVDD may be compensated for by the firsttransistor T1 connected in the diode configuration and may betransmitted to the light emitting diode ED.

The seventh transistor T7 may include a first electrode connected to thesecond electrode of the sixth transistor T6, a second electrodeconnected to the fourth driving voltage line VL4, and a gate electrodeconnected to the scan line GWLj+1. The seventh transistor T7 may beturned on in response to the scan signal GWj+1 applied thereto via thescan line GWLj+1 and may bypass a current of the anode of the lightemitting diode ED to the fourth driving voltage line VL4.

In an embodiment, as described above, the one end of the capacitor Cstmay be connected to the gate electrode of the first transistor T1, andthe other end of the capacitor Cst may be connected to the first drivingvoltage line VL1. A cathode of the light emitting diode ED may beconnected to the second driving voltage line VL2 that transmits thesecond driving voltage ELVSS. The structure of the pixel PXij is notlimited to the structure shown in FIG. 5, and the number of thetransistors and the number of the capacitors, which are included in onepixel PXij, and the connection relation thereof may be modified invarious ways.

FIG. 6 is a signal timing diagram showing an operation of the pixelshown in FIG. 5.

Referring to FIGS. 5 and 6, in an embodiment, the scan signal GIj havinga high level is provided via the scan line GILj during an initializationperiod within one frame Fs. When the fourth transistor T4 is turned onin response to the scan signal GIj having the high level, the firstinitialization voltage VINT1 is applied to the gate electrode of thefirst transistor T1 via the fourth transistor T4, and thus, the firsttransistor T1 is initialized.

Then, when the scan signal GCj having the high level is provided throughthe scan line GLj during a data programming and compensation period, thethird transistor T3 is turned on. The first transistor T1 is connectedin a diode configuration by the turned-on third transistor T3 and isforward-biased. During the data programming and compensation period, thesecond transistor T2 is turned on in response to the scan signal GIjhaving a low level. Then, a compensation voltage (Di-Vth) obtained bysubtracting a threshold voltage (Vth) of the first transistor T1 fromthe data signal Di provided via the data line DLi is applied to the gateelectrode of the first transistor T1. That is, a gate voltage applied tothe gate electrode of the first transistor T1 may be the compensationvoltage (Di-Vth).

The first driving voltage ELVDD and the compensation voltage (Di-Vth)are respectively applied to both ends of the capacitor Cst, and thecapacitor Cst may be charged with electric charges corresponding to adifference in voltage between the both ends of the capacitor Cst.

During the data programming and compensation period, the seventhtransistor T7 is turned on in response to the scan signal GWj+1 havingthe low level applied thereto via the scan line GWLj+1. A portion of thedriving current Id is bypassed to the fourth driving voltage line VL4 asa bypass current Ibp via the seventh transistor T7.

If the light emitting diode ED emits a light even when a minimum currentof the first transistor T1 for displaying a black image flows as adriving current, the black image may not be properly displayed. In anembodiment, as described above, the seventh transistor T7 of the pixelPXij may distribute a portion of the minimum current of the firsttransistor T1 to another current path as the bypass current Ibp ratherthan to a current path to the light emitting diode. In such anembodiment, the minimum current of the first transistor T1 means acurrent under a condition that a gate-source voltage (Vgs) of the firsttransistor T1 is less than the threshold voltage (Vth) and the firsttransistor T1 is turned off. In such an embodiment, as described above,when the minimum driving current that turns off the first transistor T1,for example, a current of less than about 10 picoamperes (pA), istransmitted to the light emitting diode ED, an image with a blackluminance is displayed. In the case where the minimum driving currentfor displaying the black image flows, an influence of bypasstransmission of the bypass current Ibp is large, however, in the casewhere a large driving current for displaying images such as a generalimage or a white image flows, the influence of the bypass current Ibp isnegligible. Accordingly, when the driving current for displaying theblack image flows, a light emitting current led of the light emittingdiode ED reduced by an amount of the bypass current Ibp, which isbypassed through the seventh transistor T7, from the driving current Idhas a minimum current amount at a level that may clearly display theblack image. Thus, a contrast ratio may be improved by realizing anaccurate black luminance image using the seventh transistor T7. In anembodiment, the bypass signal may correspond to the scan signal GWj+1having the low level, but not being limited thereto or thereby.

Then, as shown in FIG. 6, a level of the light emitting signal EMjprovided from the light emitting control line EMLj is changed to a lowlevel from a high level during a light emitting period. The fifthtransistor T5 and the sixth transistor T6 are turned on in response tothe light emitting signal EMj having the low level during the lightemitting period. As a result, the driving current Id is generated due toa difference in voltage between the gate voltage of the gate electrodeof the first transistor T1 and the first driving voltage ELVDD, thedriving current Id is supplied to the light emitting diode ED via thesixth transistor T6, and thus, the light emitting current led flowsthrough the light emitting diode ED.

FIG. 7 is a block diagram showing an embodiment of the first drivingcircuit 300 shown in FIG. 4.

Referring to FIGS. 4 and 7, an embodiment of the first driving circuit300 may include a light emitting driving circuit 310, a first scandriving circuit 320, a second scan driving circuit 330, and a third scandriving circuit 340.

The light emitting driving circuit 310 may output light emitting controlsignals EM1 to EMk, which are to be applied to the light emittingcontrol lines EML1 to EMLn shown in FIG. 4, in response to the firstscan control signal SCS1. In an embodiment, each of n and k is a naturalnumber, and n may be greater than k (i.e., n>k). That is, each of thelight emitting control signals EM1 to EMk may be applied to two or morecorresponding light emitting control lines among the light emittingcontrol lines EML1 to EMLn.

The first scan driving circuit 320 may output the scan signals GI1 toGIk, which are to be applied to the scan lines GIL1 to GILn, in responseto the first scan control signal SCS1. In an embodiment, n may begreater than k (i.e., n>k). That is, each of the scan signals GI1 to GIkmay be applied to two or more corresponding scan lines among the scanlines GIL1 to GILn.

The second scan driving circuit 330 may output the scan signals GC1 toGCs, which are to be applied to the scan lines GCL1 to GCLn, in responseto the first scan control signal SCS1. In an embodiment, s is a naturalnumber, and n may be greater than s (i.e., n>s). That is, each of thescan signals GC1 to GCs may be applied to two or more corresponding scanlines among the scan lines GCL1 to GCLn.

The third scan driving circuit 340 may output the scan signals GW1 toGWn, which are to be applied to the scan lines GWL1 to GWLn, in responseto the first scan control signal SCS1.

FIG. 8 is a block diagram showing an embodiment of the second drivingcircuit 400 shown in FIG. 4.

Referring to FIG. 8, an embodiment of the second driving circuit 400 mayinclude a light emitting driving circuit 410, a first scan drivingcircuit 420, a second scan driving circuit 430, and a third scan drivingcircuit 440.

The light emitting driving circuit 410 may output the light emittingcontrol signals EM1 to EMk, which are to be applied to the lightemitting control lines EML1 to EMLn, in response to the second scancontrol signal SCS2.

The first scan driving circuit 420 may output the scan signals GI1 toGIk, which are to be applied to the scan lines GIL1 to GILn, in responseto the second scan control signal SCS2.

The second scan driving circuit 430 may output the scan signals GC1 toGCs, which are to be applied to the scan lines GCL1 to GCLn, in responseto the second scan control signal SCS2.

The third scan driving circuit 440 may output the scan signals GW1 toGWn, which are to be applied to the scan lines GWL1 to GWLn, in responseto the second scan control signal SCS2.

FIG. 9 is a block diagram showing the first driving circuit 300 shown inFIG. 7 and the second driving circuit 400 shown in FIG. 8.

Referring to FIGS. 7 to 9, an embodiment of the display panel DP mayinclude pixels PX11 to PX14, PX21 to PX24, PX31 to PX34, PX41 to PX44,PX51 to PX54, PX61 to PX64, PX71 to PX74, and PX81 to PX84.

For convenience of illustration and description, FIG. 9 shows thirty-twopixels arranged in a matrix form in eight rows and four columns, i.e.,an arrangement of eight pixels in the second direction DR2 and fourpixels in the first direction DR1, however, the number of the pixelsincluded in the display panel DP may be modified in various ways.

Each of the pixels PX11, PX23, PX31, PX43, PX51, PX63, PX71, and PX83may be a first color pixel, e.g., a red pixel, each of the pixels PX13,PX21, PX33, PX41, PX53, PX61, PX73, and PX81 may be a second colorpixel, e.g., a blue pixel, and each of the pixels PX12, PX14, PX22,PX24, PX32, PX34, PX42, PX44, PX52, PX54, PX62, PX64, PX72, PX74, PX82,and PX84 may be a third color pixel, e.g., a green pixel.

The light emitting driving circuit 310 of the first driving circuit 300may include light emitting stages EMD1 and EMD2. The first scan drivingcircuit 320 of the first driving circuit 300 may include first scanstages GID1 and GID2. The second scan driving circuit 330 of the firstdriving circuit 300 may include second scan stages GCD1 and GCD4. Thethird scan driving circuit 340 of the first driving circuit 300 mayinclude third scan stages GWD1 to GWD8.

The light emitting stage EMD1 of the first driving circuit 300 may drivethe pixels PX11 to PX14, PX21 to PX24, PX31 to PX34, and PX41 to PX44arranged in four rows.

The light emitting stage EMD2 of the first driving circuit 300 may drivethe pixels PX51 to PX54, PX61 to PX64, PX71 to PX74, and PX81 to PX84arranged in four rows.

The first scan stage GID1 of the first driving circuit 300 may drive thepixels PX11 to PX14, PX21 to PX24, PX31 to PX34, and PX41 to PX44arranged in four rows.

The first scan stage GID2 of the first driving circuit 300 may drive thepixels PX51 to PX54, PX61 to PX64, PX71 to PX74, and PX81 to PX84arranged in four rows.

The second scan stages GCD1 to GCD4 of the first driving circuit 300 mayrespectively drive the pixels PX11 PX84 arranged in two rows.

The third scan stages GWD1 to GWD8 of the first driving circuit 300 mayrespectively drive the pixels PX11 to PX84 arranged in one row.

Each of the light emitting stages EMD1 and EMD2, the first scan stagesGID1 and GID2, and the second scan stages GCD1 to GCD4 of the firstdriving circuit 300 may have substantially a same length in the seconddirection DR2 as each other. According to an embodiment, each of thelight emitting stages EMD1 and EMD2, the first scan stages GID1 andGID2, and the second scan stages GCD1 to GCD4 of the first drivingcircuit 300 may have substantially a same circuit area as each other.

A length in the second direction DR2 of each of the third scan stagesGWD1 to GWD8 of the first driving circuit 300 may be about a half (about½) of the length in the second direction DR2 of each of the second scanstages GCD1 to GCD4 of the first driving circuit 300. The circuit areasin which the third scan stages GWD1 to GWD8 of the first driving circuit300 are respectively disposed may be smaller than the circuit areas inwhich the light emitting stages EMD1 to EMD2, the first scan stages GID1to GID2, and the second scan stages GCD1 to GCD4 of the first drivingcircuit 300 are respectively disposed.

The light emitting driving circuit 410 of the second driving circuit 400may include light emitting stages EMS1 and EMS2. The first scan drivingcircuit 420 of the second driving circuit 400 may include first scanstages GIS1 and GIS2. The second scan driving circuit 430 of the seconddriving circuit 400 may include second scan stages GCS1 to GCS4. Thethird scan driving circuit 440 of the second driving circuit 400 mayinclude third scan stages GWS1 to GWS8.

The light emitting stage EMS1 of the second driving circuit 400 maydrive the pixels PX11 to PX14, PX21 to PX24, PX31 to PX34, and PX41 toPX44 arranged in four rows.

The light emitting stage EMS2 of the second driving circuit 400 maydrive the pixels PX51 to PX54, PX61 to PX64, PX71 to PX74, and PX81 toPX84 arranged in four rows.

The first scan stage GIS1 of the second driving circuit 400 may drivethe pixels PX11 to PX14, PX21 to PX24, PX31 to PX34, and PX41 to PX44arranged in four rows.

The first scan stage GIS2 of the second driving circuit 400 may drivethe pixels PX51 to PX54, PX61 to PX64, PX71 to PX74, and PX81 to PX84arranged in four rows.

The second scan stages GCS1 to GCS4 of the second driving circuit 400may respectively drive the pixels PX11 to PX84 arranged in two rows.

The third scan stages GWS1 to GWS8 of the second driving circuit 400 mayrespectively drive the pixels PX11 to PX84 arranged in one row.

Each of the light emitting stages EMS1 and EMS2, the first scan stagesGIS1 and GIS2, and the second scan stages GCS1 to GCS4 of the seconddriving circuit 400 may have substantially a same length in the seconddirection DR2 as each other. According to an embodiment, each of thelight emitting stages EMS1 and EMS2, the first scan stages GIS1 andGIS2, and the second scan stages GCS1 to GCS4 of the second drivingcircuit 400 may have substantially a same circuit area as each other.

A length in the second direction DR2 of each of the third scan stagesGWS1 to GWS8 of the second driving circuit 400 may be about a half(about ½) of the length in the second direction DR2 of each of thesecond scan stages GCS1 to GCS4 of the second driving circuit 400.

The circuit areas in which the third scan stages GWS1 to GWS8 of thesecond driving circuit 400 are respectively disposed may be smaller thanthe circuit areas in which the light emitting stages EMS1 and EMS2, thefirst scan stages GIS1 to GIS2, and the second scan stages GCS1 to GCS4of the second driving circuit 400 are respectively disposed.

In an embodiment, as shown in FIG. 9, the first scan stages GID1 andGID2 and the second scan stages GCD1 to GCD4 of the first drivingcircuit 300 may have independent (or separate) circuit configurationsfrom each other. In such an embodiment, the first scan stages GIS1 andGIS2 and the second scan stages GCS1 to GCS4 of the second drivingcircuit 400 may have independent (separate) circuit configurations fromeach other.

FIG. 10 shows an embodiment of light emitting stages EMD1 to EMD7, firstscan stages GID1 to GID7, and second scan stages GCD1 to GCD14 of thefirst driving circuit 300.

Referring to FIGS. 9 and 10, an embodiment of the first driving circuit300 may further include a plurality of masking circuits MS11, MS12,MS21, and MS22 and a plurality of transmission circuits TS11 to TS15 andTS21 to TS212.

The masking circuits MS11, MS12, MS21, and MS22 may be electricallyconnected to some of the scan stages GID1 to GID7 and GCD1 to GCD14,respectively. The transmission circuits TS11 to TS15 and TS21 to TS212may be electrically connected to others of the scan stages GID1 to GID7and GCD1 to GCD14, respectively.

Each of the light emitting stages EMD1 to EMD7 may receive a first clocksignal CLK1, a second clock signal CLK2, and a carry signal and mayoutput the light emitting control signals EM1 to EM7.

Each of the light emitting control signals EM1 to EM7 may be commonlyapplied to the pixels PX arranged in four rows along the seconddirection DR2. In one embodiment, for example, the light emittingcontrol signal EM1 output from the light emitting stage EMD1 may beapplied to the pixels PX arranged in the first to fourth rows.

The first light emitting stage EMD1 may receive a start signal FLM_EM asthe carry signal. Each of the light emitting stages EMD2 to EMD7 exceptthe first light emitting stage EMD1 may receive a light emitting controlsignal output from a previous light emitting stage as the carry signal.In one embodiment, for example, a second light emitting stage EMD2 mayreceive the light emitting control signal EM1 output from the firstlight emitting stage EMD1 as the carry signal.

The masking circuit MS11 may selectively output a scan signal GI1 outputfrom a first first scan stage GID1 as a masking carry signal in responseto a first masking signal MSK1 and a second masking signal MSK2.

The masking circuit MS12 may selectively output a scan signal GI6 outputfrom a sixth first scan stage GID6 as the masking carry signal inresponse to the first masking signal MSK1 and the second masking signalMSK2.

The masking circuit MS21 may selectively output a scan signal GC2 outputfrom a second second scan stage GCD2 as the masking carry signal inresponse to a third masking signal MSK3 and a fourth masking signalMSK4.

The masking circuit MS22 may selectively output a scan signal GC12output from a twelfth second scan stage GID12 as the masking carrysignal in response to the third masking signal MSK3 and the fourthmasking signal MSK4.

The transmission circuit TS11 may output a scan signal GI2 output from asecond first scan stage GID2 as the carry signal in response to a firstvoltage VGL and a second voltage VGH. The first voltage VGL and thesecond voltage VGH may be provided from the voltage generator 500 (referto FIG. 4).

The transmission circuit TS12 may output a scan signal GI3 output from athird first scan stage GID3 as the carry signal in response to the firstvoltage VGL and the second voltage VGH.

The transmission circuit TS13 may output a scan signal GI4 output from afourth first scan stage GID4 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS14 may output a scan signal GIS output from afifth first scan stage GID5 as the carry signal in response to the firstvoltage VGL and the second voltage VGH.

The transmission circuit TS15 may output a scan signal G17 output from aseventh first scan stage GID7 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS21 may output a scan signal GC1 output from afirst second scan stage GCD1 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS22 may output a scan signal GC3 output from athird second scan stage GCD3 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS23 may output a scan signal GC4 output from afourth second scan stage GCD4 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS24 may output a scan signal GC5 output from afifth second scan stage GCD5 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS25 may output a scan signal GC6 output from asixth second scan stage GCD6 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS26 may output a scan signal GC7 output from aseventh second scan stage GCD7 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS27 may output a scan signal GC8 output froman eighth second scan stage GCD8 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS28 may output a scan signal GC9 output from aninth second scan stage GCD9 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS29 may output a scan signal GC10 output froma tenth second scan stage GCD10 as the carry signal in response to thefirst voltage VGL and the second voltage VGH.

The transmission circuit TS210 may output a scan signal GC11 output froman eleventh second scan stage GCD11 as the carry signal in response tothe first voltage VGL and the second voltage VGH.

The transmission circuit TS211 may output a scan signal GC13 output froma thirteenth second scan stage GCD13 as the carry signal in response tothe first voltage VGL and the second voltage VGH.

The transmission circuit TS212 may output a scan signal GC14 output froma fourteenth second scan stage GCD14 as the carry signal in response tothe first voltage VGL and the second voltage VGH.

FIG. 10 shows one embodiment having a structure in which the maskingcircuits MS11 and MS12 are electrically connected to the first and sixthfirst scan stages GID1 and GID6, respectively, for example, however, thefirst scan stages to which the masking circuits MS11 and MS12 areelectrically connected are not limited thereto or thereby and may bemodified in various ways depending on a design of the circuit. FIG. 10shows one embodiment having a structure in which the masking circuitsMS21 and MS22 are electrically connected to the second and twelfthsecond scan stages GCD2 and GCD12, respectively, however, the secondscan stages to which the masking circuits MS21 and MS22 are electricallyconnected are not limited thereto or thereby and may be modified invarious ways depending on a design of the circuit.

Each of the first scan stages GID1 to GID7 may receive the first clocksignal CLK1, the second clock signal CLK2, and the carry signal and mayoutput the scan signals GI1 to GI7.

Each of the scan signals GI1 to GI7 may be commonly applied to thepixels PX arranged in four rows in the second direction DR2. In oneembodiment, for example, the scan signal GI1 output from the first scanstage GID1 may be applied to the pixels PX arranged in the first tofourth rows.

The first scan stage GID1 may receive a start signal FLM_GI as the carrysignal. The second first scan stage GID2 may receive the masking carrysignal output from the masking circuit MS11. The seventh first scanstage GID7 may receive the masking carry signal output from the maskingcircuit MS12. The first scan stages GID3, GID4, GID5, and GID6 exceptthe first scan stages GID1, GID2, and GID7 may receive the scan signaloutput from each of the transmission circuits TS11 to TS14 as the carrysignal.

Each of the second scan stages GCD1 to GCD14 may receive the first clocksignal CLK1, the second clock signal CLK2, and the carry signal and mayoutput the scan signals GC1 to GC14.

Each of the scan signals GC1 to GC14 may be commonly applied to thepixels PX arranged in two rows in the second direction DR2. In oneembodiment, for example, the scan signal GC1 output from the second scanstage GCD1 may be applied to the pixels PX arranged in the first andsecond rows.

The second scan stage GCD1 may receive a start signal FLM_GC as thecarry signal. The second second scan stage GCD2 may receive the maskingcarry signal output from the masking circuit MS21. The fourteenth secondscan stage GCD14 may receive the masking carry signal output from themasking circuit MS22. The second scan stages GCD3 to GCD13 except thesecond scan stages GCD1, GCD2, and GCD14 may receive the scan signaloutput from each of the transmission circuits TS21 to TS212 as the carrysignal.

The masking circuits MS11, MS12, MS21, and MS22 and the transmissioncircuits TS11 to TS15 and TS21 to TS212 may have substantially the samecircuit area as each other.

In a case where the transmission circuits TS21 to TS212 are notdisposed, areas in which the scan stages are disposed may have differentcircuit densities depending on whether the masking circuits are disposedor not. In this case, a difference in characteristics betweentransistors of the circuit may occur. In an embodiment of the invention,the first driving circuit 300 may include the plural masking circuitsMS11, MS12, MS21, and MS22 and the plural transmission circuits TS11 toTS15 and TS21 to TS212. In such an embodiment, the masking circuitsMS11, MS12, MS21, and MS22 may be electrically connected to some of thescan stages GID1 to GID7 and GCD1 to GCD14, respectively. In such anembodiment, the transmission circuits TS11 to TS15 and TS21 to TS212 maybe electrically connected to others of the scan stages GID1 to GID7 andGCD1 to GCD14, respectively. Accordingly, in such an embodiment, theareas in which the scan stages GID1 to GID7 and GCD1 to GCD14 aredisposed may include the same number of transistors and may have thesame circuit density as each other. In such an embodiment, the same loadmay be applied to the areas, and the scan stages GID1 to GID7 and GCD1to GCD14 arranged in the areas may have the same characteristics as eachother. Accordingly, in such an embodiment, a difference in brightnessbetween rows in which the pixels PX are arranged may be reduced, and acrosstalk phenomenon in which an image quality of the display panel DPdecreases due to different electrical interference between the pixels PXmay be reduced.

In an embodiment, as shown in FIG. 10, the masking circuits MS11 andMS12 are alternately disposed every five first scan stages among thefirst scan stages GID1 to GID7, and the masking circuits MS21 and MS22are alternately disposed every five first scan stages among the secondscan stages GCD1 to GCD14. However, the disclosure is not limited to theembodiment shown in FIG. 10, and positions of the masking circuits MS11,MS12, MS21, and MS22 may be modified in various ways.

In FIG. 10, for convenience of illustration, the third scan stages ofthe third scan driving circuit 340 (refer to FIG. 7) are not shown,however, the third scan stages may have substantially the sameconfiguration as that of the first scan stages GID1 to GID7 and thesecond scan stages GCD1 to GCD14.

In an embodiment, the second driving circuit 400 (refer to FIG. 8) mayhave a circuit configuration similar to that of the first drivingcircuit 300 shown in FIG. 10.

FIG. 11 is a circuit diagram showing the first second scan stage and thetransmission circuit in the first driving circuit according to anembodiment of the disclosure.

FIG. 11 shows an embodiment of the second scan stage GCD1 and thetransmission circuit TS21 shown in FIG. 10. Each of the second scanstages GCD1 to GCD14 shown in FIG. 10 may have substantially the samecircuit configuration as that of the first second scan stage GCD1 shownin FIG. 11. Each of the transmission circuits TS21 to TS212 shown inFIG. 10 may have substantially the same circuit configuration as that ofthe transmission circuit TS21 shown in FIG. 11.

Referring to FIG. 11, the second scan stage GCD1 may include first,second, third, and fourth input terminals IN1, IN2, IN3, and IN4, firstand second voltage terminals V1 and V2, a scan output terminal OUT1,transistors M1, M2, M3, M4, M5, M6, M7, M8, M9, M10, M11, M12, and M13,and capacitors NC1, NC2, and NC3. In an embodiment, as shown in FIG. 11,each of the transistors M1 to M13 may be a P-type transistor, but thedisclosure is not limited thereto or thereby. In one alternativeembodiment, for example, some or all of the transistors M1 to M13 may bean N-type transistor.

In an embodiment, the second scan stage GCD1 may receive a third clocksignal CLK3, a fourth clock signal CLK4, and the start signal FLM_GC viathe first to third input terminals IN1 to IN3 and may receive the firstvoltage VGL and the second voltage VGH via the first and second voltageterminals V1 and V2. The second scan stage GCD1 may output the scansignal GC1 via the scan output terminal OUT1.

In each of some scan stages among the second scan stages GCD1 to GCD14shown in FIG. 10, for example, odd-numbered scan stages, the first inputterminal IN1 may receive the third clock signal CLK3, and the secondinput terminal IN2 may receive the fourth clock signal CLK4. Inaddition, in each of some scan stages among the second scan stages GCD1to GCD14, for example, even-numbered scan stages, the first inputterminal IN1 may receive the fourth clock signal CLK4, and the secondinput terminal IN2 may receive the third clock signal CLK3.

The transistor M1 may be connected between the third input terminal IN3and a first node N1 and may include a gate electrode connected to thethird input terminal IN3. The transistor M2 may be connected between thesecond voltage terminal V2 and a sixth node N6 and may include a gateelectrode connected to a fourth node N4. The transistor M3 may beconnected between the sixth node N6 and the second input terminal IN2and may include a gate electrode connected to a second node N2.

Transistors M4-1 and M4-2 may be connected between the fourth node N4and the first input terminal IN1 and connected to each other in series.Each of the transistors M4-1 and M4-2 may include a gate electrodeconnected to the first node N1. The transistor M5 may be connectedbetween the fourth node N4 and the first voltage terminal V1 and mayinclude a gate electrode connected to the first input terminal IN1. Thetransistor M6 may be connected between a third node N3 and a seventhnode N7 and may include a gate electrode connected to the second inputterminal IN2. The transistor M7 may be connected between the seventhnode N7 and the second input terminal IN2 and may include a gateelectrode connected to a fifth node N5.

The transistor M8 may be connected between the second voltage terminalV2 and the third node N3 and may include a gate electrode connected tothe first node N1. The transistor M9 may be connected between the secondvoltage terminal V2 and the scan output terminal OUT1 and may include agate electrode connected to the third node N3. The transistor M10 may beconnected between the scan output terminal OUT1 and the first voltageterminal V1 and may include a gate electrode connected to the secondnode N2. The transistor M11 may be connected between the fourth node N4and the fifth node N5 and may include a gate electrode connected to thefirst voltage terminal V1. The transistor M12 may be connected betweenthe first node N1 and the second node N2 and may include a gateelectrode connected to the first voltage terminal V1.

The transistor M13 may be connected between the second voltage terminalV2 and the first node N1 and may include a gate electrode connected tothe fourth input terminal IN4. The fourth input terminal IN4 may receivea reset signal ESR. The reset signal ESR may be a signal included in thefirst scan control signal SCS1 (refer to FIG. 4) and the second scancontrol signal SCS2 (refer to FIG. 4), which are provided from thedriving controller 100 (refer to FIG. 4).

The reset signal ESR may be activated to a low level when the electronicdevice DD (refer to FIG. 1) is powered on or reset. When the resetsignal ESR is at the low level, the transistor M13 may be turned on, andthe first node N1 and the second node N2 may be maintained at a voltagelevel of the second voltage VGH, i.e., a high level. Accordingly, thetransistors M3, M4-1, M4-2, M8, and M10 are maintained in a turned-offstate, and the scan signal GC1 output via the scan output terminal OUT1may be prevented from being output at an undesired level.

The capacitor NC1 may be connected between the second voltage terminalV2 and the third node N3. The capacitor NC2 may be connected between thefifth node N5 and the seventh node N7. The capacitor NC3 may beconnected between the sixth node N6 and the second node N2.

The transmission circuit TS21 may include first and second transmissiontransistors MT1 and MT2, first and second input terminals MIN1 and MIN2,and a carry output terminal OUT2.

The transmission circuit TS21 may output a carry signal CR1 in responseto the first voltage VGL applied thereto via the first input terminalMIN1. The transmission circuit TS21 may prevent the carry signal CR1from being set to the first voltage VGL in response to the secondvoltage VGH applied thereto via the second input terminal MIN2. In oneembodiment, for example, the first transmission transistor MT1 may bealways maintained in an on-state, and the second transmission transistorMT2 may be always maintained in an off-state.

The first transmission transistor MT1 may be connected between the scanoutput terminal OUT1 and the carry output terminal OUT2 and may includea gate electrode to which the first voltage VGL is applied. The secondtransmission transistor MT2 may be connected between the first voltageterminal V1 and the carry output terminal OUT2 and may include a gateelectrode to which the second voltage VGH is applied.

FIG. 12 is a circuit diagram showing a second scan stage and a maskingcircuit in a first driving circuit according to an embodiment of thedisclosure. In FIG. 12, the same reference numerals denote the sameelements in FIG. 11, and thus, any repetitive detailed descriptions ofthe same elements will be omitted.

Referring to FIG. 12, the second scan stage GCD2 may receive a thirdclock signal CLK3, a fourth clock signal CLK4, and a carry signal CR1via first, second, and third input terminals IN1, IN2, and IN3. Thesecond scan stage GCD2 may output a scan signal GC2 via a scan outputterminal OUT1. The carry signal CR1 input via the third input terminalIN3 may be a scan signal GI2 output from a first second scan stage GCD1.

A masking circuit MS21 may include first and second masking transistorsMM1 and MM2, first and second input terminals MIN1 and MIN2, and a carryoutput terminal OUT2.

The masking circuit MS21 may stop or mask outputting of a carry signalCR2 in response to a third masking signal MSK3 applied thereto via thefirst input terminal MIN1 and may set the carry signal CR2 as a firstvoltage VGL in response to a fourth masking signal MSK4 applied theretovia the second input terminal MIN2.

The first masking transistor MM1 may be connected between the scanoutput terminal OUT1 and the carry output terminal OUT2 and may includea gate electrode connected to the first input terminal MIN1. The secondmasking transistor MM2 may be connected between a first voltage terminalV1 and the carry output terminal OUT2 and may include a gate electrodeconnected to the second input terminal MIN2.

When the third masking signal MSK3 provided via the first input terminalMIN1 has a low level and the fourth masking signal MSK4 provided via thesecond input terminal MIN2 has a high level, the masking circuit MS21may output the scan signal GC2 as the carry signal CR2.

When the third masking signal MSK3 provided via the first input terminalMIN1 has the high level and the fourth masking signal MSK4 provided viathe second input terminal MIN2 has the low level, the masking circuitMS21 may not output the scan signal GC2 as the carry signal CR2, and thecarry signal CR2 may be maintained at the first voltage VGL.

FIG. 13A is a waveform diagram showing the masking signal, the scansignal, and the carry signal according to an embodiment of thedisclosure. FIG. 13B is a waveform diagram showing signals according toa comparative example.

Referring to FIGS. 10 to 13A, in an embodiment, the scan signal GC2 mayinclude a first portion P1 having a first level LV1 and a second portionP2 subsequent to or provided after the first portion P1 and having asecond level LV2 lower than the first level LV1.

According to an embodiment of the disclosure, each of the scan signalsmay include the first portion P1 and the second portion P2. In such anembodiment, a size of the circuit for providing the scan signals maydecrease due to the second portion P2 having the second level LV2 lowerthan the first level LV1. In such an embodiment, the size of the scandriving circuits 320, 330, and 340 (refer to FIG. 7) may decrease.Accordingly, the non-display area NDA (refer to FIG. 1) of theelectronic device DD (refer to FIG. 1) may decrease.

Each of the third masking signal MSK3 and the fourth masking signal MSK4may have a width MW greater than a width GW of the scan signal GC2. Inone embodiment, for example, a width of a signal may mean a timeduration when the signal is at high level or a time duration when thesignal is at low level.

The third masking signal MSK3 and the fourth masking signal MSK4 maycover (or overlap an entire portion of) the scan signal GC2. The thirdmasking signal MSK3 and the fourth masking signal MSK4 may overlap thescan signal GC2.

The masking circuit MS21 may stop or mask outputting of the scan signalGC2 as the carry signal CR2 when the third masking signal MSK3 providedvia the first input terminal MIN1 has the high level.

The masking circuit MS21 may set the carry signal CR2 as the firstvoltage VGL when the fourth masking signal MSK4 provided via the secondinput terminal MIN2 has the low level.

The scan signal GC3 output from the second scan stage GCD3 whichreceives the carry signal CR2 set as the first voltage VGL may bemaintained at low level. Accordingly, a carry signal CR3 output from thetransmission circuit TS22 may be maintained at low level.

FIG. 13A shows an embodiment of a method of driving the electronicdevice in the multi-frequency mode MFM (refer to FIG. 2B) by controllingthe masking circuit MS21 electrically connected to the second scan stageGCD2, but not being limited thereto or thereby. In one alternativeembodiment, for example, the electronic device may be driven in themulti-frequency mode MFM (refer to FIG. 2B) by controlling the maskingcircuit MS22 electrically connected to the second scan stage GCD12, andin this case, a length in the second direction DR2 of the second displayarea DA2 (refer to FIG. 1) may increase. In such an embodiment, thelength in the second direction DR2 of the first display area DA1 (referto FIG. 1) and the second display area DA2 (refer to FIG. 1) may beadjusted based on a signal level of the third and fourth masking signalsMSK3 and MSK4.

FIG. 13A shows only the scan signals GC2 and GC3 for convenience ofillustration, however, the first and third scan driving circuits 320 and340 (refer to FIG. 7) and the first and third scan driving circuits 420and 440 (refer to FIG. 8) may drive the scan signals GC1 and GW1 similarto the scan signals GC2 and GC3.

In a comparative example, referring to FIG. 13B, a third masking signalMSK-P may have a width MW-P equal to or smaller than the width GW of thescan signal GC2, differently from an embodiment of the invention. In thecomparative example, the third masking signal MSK-P may not cover (oroverlap an entire portion of) the scan signal GC2. The masking circuitMS21 which receives the third masking signal MSK-P may only partiallystop or mask outputting of the scan signal GC2 as a carry signal CR2-Pand may output a first residual carry signal RS1. A scan signal GC3-Poutput from the second scan stage GCD3 which receives the carry signalCR2-P including the residual carry signal RS1 may include a residualscan signal RS2. The carry signal CR3-P output from the transmissioncircuit TS22 may include a second residual carry signal RS3. In thecomparative example, a difference in brightness between rows in whichthe pixels PX are arranged may occur since the first residual carrysignal RS1 affects a waveform of the scan signal GC3-P. However,according to an embodiment of the disclosure, the third masking signalMSK3 and the fourth masking signal MSK4 may cover (or overlap an entireportion of) the scan signal GC2. The masking circuit MS21 may stop ormask outputting of the scan signal GC2 as the carry signal CR2. Thecarry signal CR3 output from the transmission circuit TS22 may bemaintained at low level. Accordingly, the brightness difference may beeffectively prevented from occurring between the rows in which thepixels PX are arranged.

In a comparative example, as shown in FIG. 13B, the third masking signalMSK-P may have the width MW-P greater than the width GW of the scansignal GC2, but the third masking signal MSK-P may not cover the scansignal GC2. The masking circuit MS21 which receives the third maskingsignal MSK-P may only partially stop or mask outputting of the scansignal GC2 as the carry signal CR2-P and may output the first residualcarry signal RS1. Accordingly, the first residual carry signal RS1 mayaffect the waveform of the scan signal GC3-P, and thus, the brightnessdifference may occur between the rows in which the pixels PX arearranged. However, according to an embodiment of the disclosure, thethird masking signal MSK3 and the fourth masking signal MSK4 may cover(or overlap an entire portion of) the scan signal GC2. The maskingcircuit MS21 may stop or mask outputting of the scan signal GC2 as thecarry signal CR2. The carry signal CR3 output from the transmissioncircuit TS22 may be maintained at low level. Accordingly, the brightnessdifference may be effectively prevented from occurring between the rowsin which the pixels PX are arranged.

FIG. 14 is a waveform diagram showing the masking signal and the scansignal according to an embodiment of the disclosure.

Referring to FIGS. 10 to 14, in an embodiment, the scan signal GI1output from the first scan stage GID1 electrically connected to themasking circuit MS11 may have a first width GW1. The scan signal GI6output from the first scan stage GID6 electrically connected to themasking circuit MS12 may have a second width GW2. The first width GW1may be substantially the same as the second width GW2.

The scan signal GI1 output from the first scan stage GID1 electricallyconnected to the masking circuit MS11 may not overlap the scan signalGI6 output from the first scan stage GID6 electrically connected to themasking circuit MS12.

The scan signal GI1 may not overlap the first masking signal MSK1 andthe second masking signal MSK2. According to an embodiment of thedisclosure, the scan signal GI1 may not be affected by the first maskingsignal MSK1 and the second masking signal MSK2. Accordingly, thebrightness difference may be prevented from occurring between a pixelrow to which the scan signal GI1 is provided and an adjacent pixel row,and the crosstalk phenomenon in which an image quality of the displaypanel DP decreases due to different electrical interference between thepixels PX may be reduced.

The first masking signal MSK1 may have a third width MW1. The secondmasking signal MSK2 may have a fourth width MW2. The third width MW1 maybe substantially the same as the fourth width MW2.

The third width MW1 and the fourth width MW2 may be greater than thefirst width GW1 and the second width GW2.

The first masking signal MSK1 and the second masking signal MSK2 maycover (or overlap an entire portion of) the scan signal GI6. The firstmasking signal MSK1 and the second masking signal MSK2 may overlap thescan signal GI6.

When the first masking signal MSK1 has the high level, the maskingcircuit MS12 may stop or mask outputting of the scan signal GI6 as thecarry signal. When the second masking signal MSK2 has the low level, themasking circuit MS12 may set the carry signal as the first voltage VGL.

The scan signal GI7 output from the first scan stage GID7 which receivesthe carry signal set as the first voltage VGL may be maintained at lowlevel. Accordingly, the carry signal output from the transmissioncircuit TS15 may be maintained at low level.

FIG. 14 shows only the scan signals GI1 to GI7 for convenience ofillustration, and the second and third scan driving circuits 330 and 340(refer to FIG. 7) and the second and third scan driving circuits 430 and440 (refer to FIG. 8) may provide the scan signals GC1 and GW1 (refer toFIG. 7) similar to the scan signals GI1 to GI7.

FIG. 15 is a waveform diagram showing scan signals in themulti-frequency mode according to an embodiment of the disclosure.

Referring to FIGS. 1 and 15, a frequency of the scan signals GI1 toGI1920 may be about 12 0 Hz in the multi-frequency mode MFM (refer toFIG. 3B), and a frequency of the scan signals GI1921 to GI3840 may beabout 1 Hz in the multi-frequency mode MFM.

The scan signals GI1 to GI1920 may be activated at high level in each offirst frame F1 to 120th frame F120, and the scan signals GI1921 toGI3840 may be activated at high level only in the first frame F1.

Accordingly, the first display area DA1 in which the video is displayedmay be driven in response to the scan signals GI1 to GI1920 at a normalfrequency, e.g., about 120 Hz, and the second display area DA2 in whichthe still image is displayed may be driven in response to the scansignals GI1921 to GI3840 at a low frequency, e.g., about 1 Hz. Sinceonly the second display area DA2 in which the still image is displayedis driven at the low frequency, the power consumption of the electronicdevice DD (refer to FIG. 1) may be reduced without deterioration indisplay quality.

The scan signals GI1 to GI1920 may correspond to the first display areaDA1 of the electronic device DD shown in FIG. 1, and the scan signalsGI1921 to GI3840 may correspond to the second display area DA2 shown inFIG. 1, for example, and it will be understood that a range of the scansignals GI1 to GI3840 corresponding to each of the first display areaDA1 and the second display area DA2 is not limited thereto or thereby.In one embodiment, for example, the size of the first display area DA1driven at the normal frequency and the size of the second display areaDA2 driven at the low frequency may be varied, and when the size of thesecond display area DA2 driven at the low frequency increases, the powerconsumption of the electronic device DD may be further reduced.

FIG. 15 shows only the scan signals GI1 to GI3840, for convenience ofillustration, and it will be understood that the light emitting drivingcircuit 310 (refer to FIG. 7), the second scan driving circuit 330(refer to FIG. 7), the third scan driving circuit 340 (refer to FIG. 7),the light emitting driving circuit 410 (refer to FIG. 8), the secondscan driving circuit 430 (refer to FIG. 8), and the third scan drivingcircuit 440 (refer to FIG. 8) may generate scan signals GC1 to GC3840and GW1 to GW3840 and light emitting signals EM1 to EM3840 similar tothe scan signals GI1 to GI3840.

The invention should not be construed as being limited to theembodiments set forth herein. Rather, these embodiments are provided sothat this disclosure will be thorough and complete and will fully conveythe concept of the invention to those skilled in the art.

While the invention has been particularly shown and described withreference to embodiments thereof, it will be understood by those ofordinary skill in the art that various changes in form and details maybe made therein without departing from the spirit or scope of theinvention as defined by the following claims.

What is claimed is:
 1. An electronic device comprising: a display panelcomprising a plurality of data lines, a plurality of scan lines, and aplurality of pixels connected to the data lines and the scan lines; aplurality of scan stages corresponding to the scan lines, wherein eachof the scan stages receives clock signals and a carry signal, andoutputs a scan signal; a plurality of masking circuits electricallyconnected to some of the scan stages, respectively, wherein each of themasking circuits outputs a masking carry signal in response to a maskingsignal and the scan signal; and a plurality of transmission circuitselectrically connected to others of the scan stages, respectively,wherein each of the transmission circuits outputs the scan signal outputfrom a corresponding scan stage among the scan stages, wherein a j-thscan stage among the scan stages receives one of the scan signal outputfrom a (j−1)-th scan stage and the masking carry signal as the carrysignal, and j is an integer greater than
 1. 2. The electronic device ofclaim 1, wherein the masking signal comprises a first masking signal anda second masking signal, each of the masking circuits outputs the scansignal output from the corresponding scan stage as the masking carrysignal when the first masking signal has a first level and the secondmasking signal has a second level different from the first level, andeach of the masking circuits does not output the scan signal output fromthe corresponding scan stage as the masking carry signal when the firstmasking signal has the second level and the second masking signal hasthe first level.
 3. The electronic device of claim 2, wherein each ofthe masking circuits comprises: a first masking transistor connectedbetween a terminal of the corresponding scan stage, from which the scansignal of the corresponding scan stage is output, and a carry outputterminal, wherein the first masking transistor includes a first gateelectrode which receives the first masking signal; and a second maskingtransistor connected between the carry output terminal and a firstvoltage terminal which receives a first voltage of the correspondingscan stage, wherein the second masking transistor includes a second gateelectrode which receives the first masking signal.
 4. The electronicdevice of claim 3, wherein each of the transmission circuits comprises:a first transmission transistor connected between the terminal of thecorresponding scan stage and the carry output terminal, wherein thefirst transmission transistor includes a third gate electrode whichreceives the first voltage; and a second transmission transistorconnected between the carry output terminal and the first voltageterminal, wherein the second transmission transistor includes a fourthgate electrode which receives a second voltage different from the firstvoltage.
 5. The electronic device of claim 1, further comprising: adriving controller which drives the display panel in a multi-frequencymode and a normal mode.
 6. The electronic device of claim 5, wherein thedisplay panel comprises a first display area and a second display areaadjacent to the first display area, the first display area is driven ata first driving frequency in the multi-frequency mode, and the seconddisplay area is driven at a second driving frequency different from thefirst driving frequency in the multi-frequency mode.
 7. The electronicdevice of claim 6, wherein the first driving frequency is higher thanthe second driving frequency.
 8. The electronic device of claim 6,wherein the driving controller controls the scan stages and the maskingcircuits.
 9. The electronic device of claim 6, wherein the drivingcontroller substantially simultaneously displays a still image and avideo through the first display area in the multi-frequency mode andchanges the multi-frequency mode of the first display area to the normalmode when a time duration of the still image reaches a predeterminedtime.
 10. The electronic device of claim 1, wherein areas in which themasking circuits are respectively disposed are the same as areas inwhich the transmission circuits are respectively disposed.
 11. Theelectronic device of claim 1, further comprising: a plurality of lightemitting stages, wherein the display panel further comprises a pluralityof light emitting control lines electrically connected to the pixels,respectively, and the light emitting stages are electrically connectedto the light emitting control lines, respectively, and receive the clocksignals and the carry signal.
 12. The electronic device of claim 11,wherein the scan stages comprise first scan stages, second scan stagesand third scan stages, areas in which the first scan stages, the secondstages, and the light emitting stages are respectively disposed have asame size as each other, and areas in which the third scan stages arerespectively disposed have a size smaller than areas in which the firstscan stages are respectively disposed.
 13. The electronic device ofclaim 1, wherein the masking signal has a width greater than a width ofthe scan signal.
 14. The electronic device of claim 13, wherein the scansignal comprises: a first portion having a first level; and a secondportion subsequent to the first portion and having a second level lowerthan the first level.
 15. The electronic device of claim 13, wherein themasking signal overlaps an entire portion of the scan signal output fromone of the scan stages respectively connected to the masking circuits.16. The electronic device of claim 1, wherein a first scan signal outputfrom an n-th scan stage among the scan stages respectively connected tothe masking circuits does not overlap a second scan signal output froman (n−1)-th scan stage among the scan stages, wherein n is an integergreater than
 1. 17. The electronic device of claim 16, wherein thesecond scan signal does not overlap the masking signal.
 18. Theelectronic device of claim 16, wherein the first scan signal overlapsthe masking signal.
 19. The electronic device of claim 16, wherein themasking signal has a width greater than a width of each of the first andsecond scan signals.
 20. A method of driving an electronic devicecomprising a display panel and a plurality of scan stages, the methodcomprising: allowing an i-th scan stage among the scan stages to receiveclock signals and a carry signal and to output a first scan signal,wherein is an integer greater than 0; allowing a masking circuitconnected to the i-th scan stage to receive a masking signal and tooutput a masking carry signal based on the masking signal; and allowingan (i+1)-th scan stage among the scan stages to receive the maskingcarry signal as the carry signal and to output a second scan signal,wherein the masking signal has a first width greater than a second widthof the first scan signal, and the masking signal overlaps an entireportion of the first scan signal.
 21. The method of claim 20, whereinthe masking signal comprises a first masking signal and a second maskingsignal, and the outputting the masking carry signal comprises:outputting the first scan signal as the masking carry signal when thefirst masking signal has a first level and the second masking signal hasa second level different from the first level; and allowing the firstscan signal not to be output as the masking carry signal when the firstmasking signal has the second level and the second masking signal hasthe first level.
 22. The method of claim 20, further comprising: drivingthe display panel, wherein the display panel comprises a first displayarea and a second display area adjacent to the first display area, andthe driving the display panel comprises: driving the display panel in amulti-frequency mode or a normal mode; driving the first display area ata first driving frequency in the multi-frequency mode; and driving thesecond display area at a second driving frequency different from thefirst driving frequency in the multi-frequency mode.
 23. The method ofclaim 22, wherein the first driving frequency is higher than the seconddriving frequency.
 24. The method of claim 22, wherein the driving thedisplay panel in the multi-frequency mode or the normal mode comprises:substantially simultaneously displaying a still image and a videothrough the first display area in the multi-frequency mode; and changingthe multi-frequency mode of the first display area to the normal modewhen a time duration of the still image reaches a predetermined time.25. The method of claim 20, wherein the carry signal comprises: a firstportion having a first level; and a second portion subsequent to thefirst portion and having a second level lower than the first level. 26.The method of claim 20, wherein the masking circuit is provided inplural, and a third scan signal output from an n-th scan stage among thescan stages respectively connected to the masking circuits does notoverlap a fourth scan signal output from an (n−1)-th scan stage amongthe scan stages, wherein n is an integer greater than
 1. 27. The methodof claim 26, wherein the fourth scan signal does not overlap the maskingsignal.
 28. The method of claim 26, wherein the third scan signaloverlaps the masking signal.
 29. The method of claim 26, wherein themasking signal has a width greater than a width of each of the thirdscan signal and the fourth scan signal.